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  • 1
    Electronic Resource
    Electronic Resource
    Advanced welding process. By J. Norrish, IOP Publishing, Bristol 1992, 375 pp., softcover, ISBN 0-85274-326-2 (1993)
    Weinheim : Wiley-Blackwell
    Advanced Materials 5 (1993), S. 486-486 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19930050622
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  • 2
    Electronic Resource
    Electronic Resource
    Ohmic distortion of mass transport and of current-voltage curves at a channel electrode (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 913-917 
    Details
    ISSN: 1040-0397
    Keywords: Channel electrodes ; Ohmic distortion ; Simulating mass transport ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The distortion caused by the ohmic resistance of the solution in a channel electrode experiment has been calculated by combining a three-dimensional finite element approach based on a resistor network, solved by the SPICE program, in an iterative procedure with the backward-implicit finite difference method, for the case of a reversible 1-electron reduction. By this means, the current distribution over the electrode may be calculated taking into account not only the nonuniform potential distribution imposed by the electrolyte resistance but also the alteration to mass transport induced by the potential distribution. The potential-dependent variation in Tafel slope introduced by the ohmic distortion is calculated and is shown to be in close agreement with experimental data obtained from the reversible one-electron reduction of p-chloranil, allowing the practical current range for experimental measurements to be assessed and if necessary extended. The three-dimensional SPICE simulation has also been applied to study the effect of reducing the electrode width to a small fraction of the channel width, when significant current flow to the sides of the electrode will occur.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140081012
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  • 3
    Electronic Resource
    Electronic Resource
    Polymerization of acetaldehyde. I. A new polymerization process with tetraisopropyl titanate catalyst (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 14 (1976), S. 1297-1299 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.170140531
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  • 4
    Electronic Resource
    Electronic Resource
    Malonic ester-blocked aliphatic isocyanates (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 2423-2428 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Products formed on pyrolysis of malonic ester-blocked aliphatic isocyanates depend on the enolizability of the blocked isocyanate. Previous work reported that diethyl malonate-blocked aliphatic isocyanates on pyrolysis yield predominantly “abnormal” products rather than the expected isocyanates. It has now been shown that this behavior results from the reactions of the enol forms. A nonenolizable diethyl methylmalonate-blocked isocyanate has been synthesized. On pyrolysis essentially quantitative conversion to isocyanate and diethyl methylmalonate occurs. Significant differences in reactivity with amines and alcohols also result from the difference in enolizability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.170170814
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  • 5
    Electronic Resource
    Electronic Resource
    Styrene emulsion polymerization: Kinetics and particle size distributions in highly swollen latex systems (1983)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 21 (1983), S. 985-997 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The results are reported of studies on the kinetics and the time evolution of the particle size distribution in seeded styrene emulsion polymerization systems wherein the seed latex particles were highly swollen with monomer as a result of prior swelling by dodecane. Conditions were such that no new latex particles were formed nor was a significant number of monomer droplets present (“Interval III”). The data were fitted to obtain values for the rate coefficients for entry and exit (desorption) of free radicals. It was found that, during the early part of the polymerization (when the polymer:monomer ratio in the latex particles is considerably less then in an equivalent emulsion polymerization system without dodecane), the entry rate coefficient was much smaller than that measured in systems without dodecane. This effect is consistent with an entry mechanism wherein entering free radicals must displace surfactant molecules from the latex particles.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1983.170210407
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  • 6
    Electronic Resource
    Electronic Resource
    Raman spectroscopy of supercoiled and nicked ColE1 plasmid (1989)
    New York : Wiley-Blackwell
    Biopolymers 28 (1989), S. 1515-1526 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Native supercoiled and nicked Co1E1 DNA were examined using laser Raman spectroscopy. Co1E1 contains 6646 base pairs (bp) and, when supercoiled, approximately 47 negative supercoils. An analytical buoyant density gradient centrifugation technique developed by Burke and Bauer was scaled to preparative quantities, and used to isolate the supercoiled plasmid fraction from its nicked counterpart. This procedure allowed enriched fractions of the supercoiled plasmid to be extracted without the use of the optical contaminant ethidium bromide. The intensities of several Raman bands were altered between the spectra of the two topological forms. Notably absent were any changes in bands arising from cytosine and guanine vibrations. The observed changes are interpreted in terms of the polymorphic structures which have been observed in many DNA structural studies. The results of this study suggest that accommodation of supercoiling takes place chiefly in A-T base pairs and backbone moieties, without substantial modification of G-C base-pair structure. Premelting effects may account for the observed changes, including a slight shift to lower frequency of a band known to be responsive to base-pair disruption. Heteronomous ribose sugar pucker is evident in both supercoiled and nicked plasmid species. No gross conformational transitions were detected for native supercoiled DNA, and consequently, subtle rearrangements appear sufficient to absorb the supercoiling deformations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360280904
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  • 7
    Electronic Resource
    Electronic Resource
    Concentration dependence of proteoglycan diffusion (1985)
    New York : Wiley-Blackwell
    Biopolymers 24 (1985), S. 2165-2173 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mutual diffusion coefficient of the bovine nasal cartilage proteoglycan subunit is found to increase rapidly with increasing concentration and decreasing ionic strength. These results have been obtained by analysis of the boundary relaxation of concentration gradients in the analytical ultracentrifuge by schlieren optics. The diffusion behavior can be understood in terms of the nonideality of the proteoglycan. The magnitude of the nonideality is dominated by charge interactions, whereas the influence of molecular size and associated excluded-volume interactions is small. The concentration dependence of the apparent diffusion coefficient of the proteoglycan subunit from dynamic light scattering was found, in contrast, to decrease with increasing concentration. Computer simulation of the dynamic light scattering suggests that the presence of a small population of aggregates may account for the difference in the two types of diffusion measurement due to their marked influence on the scattering.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360241111
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  • 8
    Electronic Resource
    Electronic Resource
    Graft copolymers from peroxidized EPDM rubber (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 32 (1986), S. 5619-5625 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The transition metal catalyzed peroxidation of the pendant allylic functionality in EPDM rubbers with tertiary butyl hydroperoxide results in elastomeric, high polymer peroxides. The peroxidized EPDM rubbers are useful as free radical initiators for the polymerization and grafting of vinyl monomers in the preparation of comb-type structures. The grafted EPDM rubbers are efficient impact modifiers for thermoplastic resins so long as the polymer grafted onto the EPDM is identical to or is thermodynamically miscible with the composition of said thermoplastic resin.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1986.070320628
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  • 9
    Electronic Resource
    Electronic Resource
    The heterogeneous character of the dilute acid hydrolysis of crystalline cellulose (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 1373-1394 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The end-attack model proposed by Sharples [Trans. Faraday Soc., 53, 1003 (1957)] for the dilute acid hydrolysis of crystalline cellulose was tested using the results from the size-exclusion chromatographic analysis of samples of crystalline cellulose I and cellulose II hydrolyzed in 6.1N HCl at 107°C. The differential number distribution of the molecular weight of hydrolyzed cellulose was found to be approximately exponential, a result which is consistent with the end-attack model. Differences in the rates of hydrolysis of cellulosic materials appear to arise from differences in both the degree of polymerization and the microstructure of hydrolyzed cellulose. Evidence is also presented which suggests that the recrystallization upon hydrolysis results in part from the lateral accretion of chains which are cleaved during the hydrolysis of amorphous regions in the cellulose microfibrils.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370520
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  • 10
    Electronic Resource
    Electronic Resource
    Surface analysis by ESCA of sulfite post-treated CTMP (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 31-42 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Handsheets of post-treated chemithermomechanical pulps (CTMP) and a sample of Whatman paper no. 1 were analyzed using an ESCA spectrometer. All of these samples revealed the presence of the C1, C2, and C3 components in the carbon (1s) peak and the O2 component in the oxygen (1s) peak; the O1 peak component which was present in the other samples was missing from the Whatman paper. Pulp sulfonation produced a reduction in C1 representing the group of carbon not bonded to oxygen, and an increase in C2 with C3 remaining relatively constant. These changes imply reductions in lignin and extractives and a corresponding increase in cellulose content on the fiber surface. Extrapolation of the C1, C2, C1/C2, and O/C curves of CTMP to zero percent sulfonation yielded the same values as those obtained for pure TMP. ESCA analysis allows us to monitor the increase of sulfur content as a function of sulfonation in accordance with results obtained from bulk pulp sulfonate content titration.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390103
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